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Physics

Physics
In general, which is the cause of a land breeze?

None of these
Heat
Pressure
Temperature

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Physics
Who gave black hole theory?

None of these
Isaac Newton
Albert Einstein
Stephen Hawking

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Physics
A bird sitting on a high tension electric wire does not get electrocuted because

It does not form a closed path for the flow of current
The body is earthed
Its feet are good insulators
It has high resistance

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Physics
The threshold frequency is the frequency below which :

Photo current is constant
Photo current increases with voltage
Photo electric emission is not possible
Photo current decreases with voltage

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Physics
If a copper wire is increased to double its length, its resistance will become

One–fourth
Double
Four times
Half

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Physics
Magnetic field lines about a current-carrying wire

Extend radially from the wire
Circle the wire in closed loops
Both of these
None of these

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